Focusing device



. Feb. 6, 1923. I 1,444,289.

E. H. WEHNES.

FOCUSING DEVICE.

men FEB. 4, 1922.

Inuentor:

Emil J1. 14447122444,v

j y f Patented Feb. 6, 1923.

EMIL HERMAN \VEENES, OF AKRON, OHIO.

FOCUSING DEVICE.

Application filed February 4, 1922. Serial No. 534,078.

To all whom it may concern:

Be it known that I, EMIL H. VVEHNns, a citizen of the United States, and a resident of Akron, in the county of Summit and State of Ohio, have invented certain new and useful Improvements in Focusing Devices, of which the following is a specification.

My present invention relates to a device for focusing the electric bulbs in headlights, spotlights, or other light projecting apparatus.

One object of my invention is to provide a device of the class described which may be instantly adjusted to any desired focus with the least amount of effort, and which will be adapted for any type of projecting apparatus, regardless of the construction of the socket holding the bulb.

Other objects will be brought out as the specification proceeds and with reference to the accompanying drawings, which are illustrative of the most preferred form of device of which I am now aware, but ohviously many changes and modifications will occur to those skilled in the art, and I therefore do not wish to be limited to the exact construction shown.

In these drawings Figure l is a side elevation of the device showing the device partly in section and the projecting apparatus and lamp in dotted lines.

Figure 2 is a sectional view along the lines 2-2 of Figure 1, looking'" in the direction of the arrows.

Figure 3 is a longitudinal section along line 3--3 of Fig. 1, viewed in the direction of the arrows.

Referring now more particularly to the drawings, wherein like characters of reference designate like parts in the several views, I have shown a projecting apparatus comprising a casing 10 within which is the usual reflector 11 having a bulb 12 at approximately the desired focus of the reflector, said bulb being electrically socketed in member 13 of any desired type. A clamp comprising an encircling member 14: adapted to grip the socket 13 and held thereon by the adj ustment of screw 15, is provided with backwardly extending arms 16 which converge toward and join each other to the rear of the socket 13.

9 .11 aperture is provided in casing 10 in which inserted a screw threaded nipple 17 having a hexagonal or suitably shaped head the threaded portion 17 extending through the casing and adapted to receive a similarly threaded nut 19. If desired, rubher washers 20 may be placed on each side of the casing 10 and between the head 18 and the nut 19. The member 17 is provided with a threaded aperture adapted to receive a similarlv threaded adjusting screw 22 having a knurled handle 28, the opposite end of this member engaging the joined ends arms 16 in any manner which will peruzit rotation of the part 22 without causing a i-nilar movement of the clamp. A satis- -tory method of joining is to have the adjusting screw 22 penetrate the arms 16 and having a cotter pin 24 pass through the end of the adjusting screw which will prevent removal thereof. A lock nut- 21 having a threaded aperture to receive the adjusting screw 22 is provided, which when tightened in the usual manner will prevent movement of the adjusting screw 22 when the desired focus has been reached. The aperture in the clamp through which the adjusting screw passes will obviously be of a sufficiently. larger here than the diameter of the adjusting screw as to prevent ready rotation of the latter.

hen it is desired to adjust the focus of the lamp within the projecting apparatus, the knurled head 23 will be turned in the proper direction, which will either cause the bulb 12 to move toward the rear of the easing or forward, according to the direction of rotation of the adjusting screw.

Such a device will be found to be of eX- treme benefit in any apparatus requiring adjustment of the focus, such as in automobiles, as in this specific case the sockets carrying the lamps are seldom, if ever, positively fixed within the casing or reflector,

' and the vibration often changes the focus.

I claim In combination, a projecting apparatus including a casing, a socket adapted to re- 5 ceive a lighting medium in proximity to said casing, a clamp including an encircling member attached to said slicket, backward? 1y extending arriis (in said clamp, engaging an adjusting screw a threaded nipple penetrating said casing, a nut threaded on said 10 nipple on the opposite side of the casing, said adjusting screw being screw threaded to said nipple.

In testimony whereof, I afiix my signature.

EMIL HERMAN Wrens. 

